| 摘要 |
An optical disk playback device comprises first and second lasers, an optical assembly, first and second optical detectors, and controller circuitry coupled to the optical detectors. The optical assembly is configured to direct incident light from the first and second lasers so as to form respective leading and trailing scanning spots on a surface of an optical disk, and is further configured to direct corresponding reflected light from the leading and trailing scanning spots on the surface of the optical disk to respective ones of the optical detectors. The controller circuitry is configured to identify a surface imperfection of the optical disk by processing the reflected light associated with the leading scanning spot prior to the trailing scanning spot reaching that surface imperfection.
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